87 of each color
27 of each color pair (support artifacts, gold cards, lands)
37 colorless cards that are in every version of the cube (artifacts and lands)
5 tri color cards of each wedge/shard (4 spells, 1 tri-land)

3 colors are pooled together to make a tri-color cube (16 card packs)

87 of each mono color x3
3 Guilds of 27 cards each
5 cards of the chosen Shard/Wedge
37 colorless support cards (artifact/lands)
384 cards total.